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Explain the characteristics of gas exchange surfaces in humans, focusing on aspects such as large surface area, thinness, adequate blood supply, and effective air ventilation.

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Cambridge IGCSE Combined ScienceGas exchange in humansSupplement content

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Explain the characteristics of gas exchange surfaces in humans, focusing on aspects such as large surface area, thinness, adequate blood supply, and effective air ventilation

  • This point belongs to Gas exchange in humans, especially Gas exchange in humans outcomes.
  • You need to be able to explain the characteristics of gas exchange surfaces in humans, focusing on aspects such as large surface area, thinness, adequate blood supply, and effective air ventilation.
  • The key ideas to know are Describe and Explain.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

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DescribeExplain

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Paper 4 structured question: Gas exchange in humans

Paper 4Theory (Extended)2 marks

Description

Characteristics of Gas Exchange Surfaces

Gas exchange surfaces in humans have several important features that facilitate efficient gas exchange.

  1. a

    Explain the importance of having a large surface area in gas exchange surfaces.

    Aim for approximately 2 distinct marking points.

    [2]
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